Question

Elm 1  

Elm 2   Hi there,
We have what I believe is an American Elm tree in our back yard (St. Louis). There were some invasive vines growing up the tree last fall so we removed them. They seemed to be growing out of the center of the base of the tree. After removing the vines, we noticed some areas around the base of the tree where the bark could be easily removed due to cracking/flaking (I guess). Under these areas is a small amount of light colored "stuff." Maybe fungal? See elm 1 photo. So we sprayed a couple of these areas with pruning seal. See elm 2 photo. So here are my questions:
1. I've since learned that pruning seal is bad for trees. Have we caused irreversible damage to the tree by spraying a couple areas with pruning seal? Or will it recover?
2. Is this stuff under the bark just a natural occurrence or is it some kind of disease that is going to destroy the tree?

The tree canopy is large and appears to be otherwise healthy without any signs of leaf discoloration.

Thank you!!!

Answer
Lauren:

I doubt if the amt of pruning seal is sufficient to have a long term negative effect.  Without a closer exam, it is difficult to tell what this stuff is.  I suspect that it may be insignificant at this point, especially if the tree appears in good healthy otherwise.  Preventing wounds to the trunk is a big thing.  Wounds can allow different microorganisms to gain entry and initiate disease infections.  By avoiding wounds and good care practices such as appropriate waterings during hot/dry periods can be a great help.

Regards
Steve